Grate-bar.



B. C. STEWART.

GRATB BAR.

APPLIoATIoN rILEn JAN.1e, 1914.

1,107,860, Patented Aug. 18, 1914, l

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Patented Aug. 18, 1914.

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rrnin sra'rns rafrnnfr lorries.

BURT C. STEWART, OF DETROIT, MICHIGAN, ASSIGNOR TO MURPHY IRON WORKS, O13" DETROIT, MICHIGAN, A. CORPORATION 0F MICHIGAN.

CRATE-BAR.

Specification of Letters Patent.

Patented Aug. 1S, 1914;.

Application filed January 16, 1914. Serial No. $12,563.

T0 all whom t may concern: v

Be it known that 1, BUn'r C. STEWART, a citizen of the United States of America, residing at Detroit, in the county of Vayne and State of Michigan, have invented certain new and useful Improvements in Grate- Bars, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to grate bars 'espec'ially designed for that type of furnaces known as automatic stokers, wherein grates are dispos-ed at an inclination and supplied with fuel by Stoker boxes from fuel magazines located at the upper edges of the grates.

and are so constructed as to provide for the passage of air throughthe gratos and insure a thorough combustion of fuel.

Another object of this invention is to pro- Vide amovable sectionalgrate bar for fur naces of the above type, wherein a plurality of bar sections are arranged end to end and connected in such a manner that an undulatory movement is secured and in which the arrangement is such that they may be substituted for the grate bars as commonly constructed in this type of furnaces and are adapted to be actuated by the means commonly employed for the purpose in such furnaces.

A further object of this invention is to provide a simple, durable and efiicicnt construction, all as hereinafter more specifically described and claimed, reference being had to the accompanying drawings, where- 1n i r Figure 1 isa cross sectional view of a portion of `a furnace `provided with grate bars in accordance with my invention; Fig. 2 is a longitudinal sectional View of a ortion of the furnace showincV the `grate Ears in elevation; Fig. 3 is aside elevation of a stationary grate bar; Fig. 4: is` a bottom plan view of the sameyFig. 5 is a side elevation of` a movable sectional bar in connection with a stationary bar;` Fig. 6 is a plan View of the same, and Fig. 7 is a cross sectional view taken onthe line VII- VII of F ig. 5.

1n the drawings for the purpose of illustration, the invention is shown as embodied man automatic stoker of an old and well known construction, but it will be under-` stood that it is adapted for use in other types of furnaces and that such changes as may be necessary to conform thereto are contemplated as coming within the scope of this invention.

`A portion of a furnace is shown embodying a fuel magazine 1, stoker boxes 2, a coking `plate 3, a grate bearer 1 and a rotary elinker grinder 5. The grate bearer 4f cooperates with the coking plate 3 in supporting stationary grate bars and movable grate bars. Thestationary bars are desig-` nated (3 and are alternately arranged relatively to the movable sectional bars. Each stationary bar has the upper end thereof provided with supporting lugs 7 that rest against the coking plate 3 and serve as spacers for the upper ends of thestationary bars. The lower end of the stationary bar is enlarged, as at 8 and providedwith a hook-shaped lug 29 that engages a side wall `of the bearing 4. The hook-shaped lugs 9.9

also serve as spacers for the lower ends of the stationary bars and each lower end has a sectorshaped opening 9 and side shields 10. The side walls of the stationary bar G are cut away at the lower edge of said bar to form a longitudinal web 11 and the sides of said web are provided with spaced guide bosses 12. The side walls of the bar, above the web 11, are provided with sets of transverse openings 13 and with equally spaced angularly disposed ribs 14:. The ribs between the sets of openings 13 extend from the upper edge of the bar to the upper edge ofthe web 11 and the remaining ribs are of a less length and provide clearance for the openings 13. The u per end of the stationary bar, atene si e thereof, is provided with `a pivot' pin 15, the purpose 0f which will presently appear.

Each movable bar comprises a plurality of longitudinally alining sections 16 of a less depth than the stationary bar 6 and their combined length is approximately that of a stationary bar. The sections 16 have the sides thereof out away, as at 17 to save material and reduce the weight of each section, and one end of each section has a rocker extension 16 and the opposite end thereof a socket 19, said sockets receiving the eXtensions 155, as best shown in Fig. 5. rl'he ends of the sections 16, at the upper edges thereof are beveled at 20, to permit of ashes and other matter easily passing` between the movable and stationary bars, and to normally maintain the upper edges of the sections 16 in the same plane as the upper edOes of the stationary bars 6 the sections 16 are provided with sets of transverse openings 21 to receive sectional pivot rods 22 that extend into Vor through the openings 13 of the stationary bar 6. rlhe sectional pivot rods 22 facilitate assembling` the grate bars and by providing sets of openings in said bars it is possible to change the location of the pivot rods and consequently the action of the movable bars and also to substitute other secv tions of diilerent relative lengths or to in crease or decrease the number of sections used in connection with each movable grate bar.

rlhc lower section of each movable grate bar has a notch and a channel shaped rim 23 to receive the rocker 2a of a rocker bar or shaft 25, which extends through the openings 9 of the stationary bars 6.

The upper section of each movable grate bar has a slot or elongated opening 26 to receive the pivot pin 15 of the stationary bar, said pin extending through the opening 26 and into a recess provided therefor in an adjoining stationary grate bar.

Any suit-able means may be employed for operating the rocker bar or shaft 25, which is limited in its movement by the upper and lower walls of the openings 9 of the stationary bar 6. The shields 10 of the stationary bar 6 prevent clinlrers and other matter from interfering' with the operation of the rocker bar or shaft 25. l/Vhen the rocker bar or shaft 25 is placed in operation an undulating or wave like movement is imparted to the sections of a movable gratel bar throughout its length by reason of said sections being pivotally mounted upon the rods 22 and their confronting,` ends connected by the roc-ker extensions 18. The confrontingl ends of the sections are beveled or cut away su'fliciently to permit of the sections rockingand as the ends of the sections are raised and lowered relatively to the upper surfaces of the stationary grate bars, the fuel supported thereby is agitated and distributed and at the same time is caused to travel slowly down the inclined grate toward the clinker grinder, receiving the requisite amount of air through the grate to complete the burning process. By the time the fuel reaches the clinler grinder thecombustion is complete and the ash and other residue are autorElie sections of the movable grate bars are prevented from becoming accidentally displaced or wabbling` upon the pivot rods 22 by the ,guide bosses 12 and these bosses are so disposed that they serve their purpose in the various positions of adjustment of the movable sections of the bars. As illustrated in Fig. 5, the movable sections are positioned for a minimum action relatively to the stationary bars, but by shifting the pivot rods 22 to other openingsof each set a maximum action may be obtained, and it is through the medium of this adjustment that the highest etliciency is obtained and certain conditions met with at the time of installation.

The manner of articulating` the sections of each movable grate bar, and imparting,` movement thereto from one end of the bar gives a positive motion which evenly distributes the fuel and imparts an even feed thereto, keeping' the grate clear to allow free passage of air through all parts thereof, thus assuring a complete combustion of fuel and a rapid discharge of ash and clinlrers.

lt is thought that the operation and utility of the ,girate bars will be'apparent without further description, and while in the drawings there is illustrated a preferred enr bodiment of my invention, it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope ofthe appended claims.

lWhat l claim is 1. A grate comprising spaced stationary bars, and articulated bar `sections pivotally supported by said stationary'bars between said stationary bars and adapted to have movement imparted thereto at one end of one of said sections.

2. A grate comprising stationary spaced bars, bar sections, pivot pins carried by each bar section and extending from said stationary bars to pivotally support said bar sections between said stationary bars, and means for imparting an undulatory movement to said bar sect-ions throughout the length of said stationary bars.

3. A furnace grate comprising` alternately arranged inclined, stationary and movable grate bars, each movable bar having; a plurality of pivotally supported articulated sections, and means at one end of said bars for imparting an undulatory movement to said movable bars throughout their length.

L1. A. furnace grate comprising` alternately arranged, inclined, stationary and movable bars, each movable ybar having articulated sections, means for pivotally supporting the sections of each movable bar whereby their movement between said stationary bars is regulated, and means at `the lowerends of said movable bars for imparting an undulatory movement to said bars throughout their length. y

A furnace grate comprising alternately `arranged inclined, stationary and movable bars, guide bosses carried by the sides of said stationary bars, each movable bar having a plurality `of pivoted articulated sections bearing against said bosses, and a rocker bar imparting an uiidulatory movement to all of said movable bars.

G. A furnace grate comprising stationary bars, pivot i'ods capable of adjustment therein,` articulated bar sections capable of adjustment upon said rods, and means for iinparting an undulatory movement to said bar sections.

7. A' furnace grate comprising a series o'tV `iii the spaces between the stationary bars `to turn freely therein, said stationary bars and sections being `formed with transverse openings, and pivot rods extending `through said openings in a plurality of said bars and sections to pivotally `and detacliably supi port said sections upon said statioiiarybars.

9. `A :furnace grate conipiising a series of o stationary barsrigidly supported at their ends and spaced apart, a series of movable bars alternating' with the stationary bars and each comprisingyayseries of sections each y havin" a transverse opening intermediate 5 its ends and a notch at one end to receive a projection on the adjacent end of the nextsection to transmit motion from one section to another, said stationary bars being each formed with a group of transverse openings adjacent to each section of the movable liars, pivot rods engaging the openings in the stationary bars and sections to pivotally support the sections intermediate their ends, and a rocker member to engage the notch in one of the end sections of each movable bar.` i y In testimony whereof I athx iny signature i in presence of two witnesses.

BURT C. STEWART.

lVitnesses: y i

Lewis E. FLnNDERs, ANNA M. DORR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. N 

